@Andrey Yasko this is exactly what I'm talking about. 12 script kiddie answers from UNA since this was posted. But ask a question that actually requires a detailed answer, and it goes unanswered.

Not one piece of documentation on form submit check. Not one piece of documentation on returning error message and setting form into 'error' state (not sure what else to call it).

If you (as UNA collective) don't want to answer developer related questions, provide the documentation. I've read blogs from two years ago saying documentation would be a priority, hold us accountable.

Well... Here I am.

Can I get some assistance, or cancel my pro support.